A spokesperson from the Middle Tennessee DOJ said there is no timetable for Rivera's resignation.

He said the US Attorney’s office in middle of Tennessee will continue doing its work. Once the president names a successor, they will go through the confirmation process.

According to the DOJ's website, Rivera took office for Middle Tennessee in April 2013 after serving as a federal prosecutor for nearly 20 years. In his post as US Attorney, Rivera was the top law enforcement official for 32 counties in middle Tennessee including Nashville.